function _iris_busy --description 'tell iris a key binding is running a program (start|stop)'
    # iris (~/.config/iris) learns a command is running from fish_preexec /
    # fish_postexec, which never fire for programs a key binding starts. Without
    # this, iris keeps treating the screen as an idle prompt while tv, yazi or
    # lazygit run: it swallows up/down/tab and can draw its menu over them.
    # Same messages as iris's own hooks; a no-op outside iris.
    set -q IRIS_FD; or return 0
    switch "$argv[1]"
        case start
            printf 'IRIS_CMD_START\x00' >&$IRIS_FD 2>/dev/null
        case stop
            printf 'IRIS_CMD_STOP:0\x00' >&$IRIS_FD 2>/dev/null
    end
    return 0
end